I bought the 128, I think the 64 is a gotcha price point. Either buy at base price for $499 or go all the way. You double for $100 more, over 2 years of use (730 days) that is a .136 cent per day difference. When you near the top of your capacity it's a pita to make stuff fit and it's better to have it and not need it than to need it and not have it. Ymmv.Should note I carry multiple very large apps, tomtom, infinity blade etc and like to have 4 movies I have never seen for airplane trips, so that colors my choice. If I didn't I would just go with the base.